A pilonidal sinus is a small tunnel that develops at the top of the crease in the buttocks. Trapped hair around the buttocks crease can lead to an abscess, and a pilonidal sinus may develop as a ...

A fungal ball is a mass that develops in your sinuses after you’ve breathed in fungal spores. Medications cannot treat it, but a doctor can surgically remove it. Sinus fungal balls are a type of ...

A sinus infection can spread to the brain, although this is rare. People require immediate medical treatment if a sinus infection reaches the brain. Sinusitis is an inflammation of the sinuses and ...